body{
    margin: 0px;
}
#zong{
    width: 900px;
    margin: 0 auto;
    background-color: gainsboro;
}

#first{
    width:280px;
    height:40px;
     margin: 0 auto;
     text-align: center;
     border-bottom: 2px solid black; 
}
#first>span{
    letter-spacing: 30px;
    font-size: 20px;
    font-weight: 600;
    line-height: 40px;
    padding-left: 30px;
    position: relative;
    bottom: -5px;  
}
#two{
    height: 30px;
    width:800px;
    margin: 0 auto ;
}
#shijian{
    width:280px;
    height:30px;
  margin:auto;
    line-height: 30px;
    
}
#two>span{
    display: inline-block;
    float: right;
    margin-top:-26px;
    padding-right: 30px;
}
#clearfix{
    clear:both;
}
#tablea{
    width:802px;
    height:272px;
 border-collapse: collapse;
    margin: 0 auto;
    border: 1px solid black;
      border-spacing: 0px;

}
#tablea>tbody>tr{height: 30px;
}
#tablea>tbody>tr>th{border: 1px solid black;
font-size: 16px;
font-weight: 500;}
#tablea>tbody>tr>td{
    padding: 0px;
    height: 30px;
    border: 1px solid black;
}
#tablea>tbody>tr>th:nth-child(1),#tablea>tbody>tr>td:nth-child(1){
  width: 300px;
  text-align: center;
 
}
#tablea>tbody>tr>th:nth-child(2),#tablea>tbody>tr>td:nth-child(2){
  width: 90px;
 
}
#tablea>tbody>tr>th:nth-child(3),#tablea>tbody>tr>td:nth-child(3){
  width: 90px;
 
}
#tablea>tbody>tr>th:nth-child(4),#tablea>tbody>tr>td:nth-child(4){
  width: 120px;
  text-align: left;
  padding-left: 5px;}
  #tablea>tbody>tr>th:nth-child(5),#tablea>tbody>tr>td:nth-child(5){
  width: 200px;
  }
 #tableb{
      width:802px;
    height:30px;
   border-collapse: collapse;
    margin: 0 auto;
      border-spacing: 0px;}
  #tablea>tbody>tr:nth-child(8)>td{
      text-align: left;
       border-spacing: 0px;
  }
  #tablea>tbody>tr:nth-child(7)>td{
      text-align: center;
  }
  #tablea>tbody>tr:nth-child(7)>td:nth-child(4){
      text-align: left;
  }
#tableb>tbody>tr>td{
    padding: 0px;
    height: 30px;
    border-collapse: collapse;
    border-right: 1px  solid black;
    border-bottom: 0px solid black;
}

#tableb>tbody>tr>td:nth-child(1){
    width:100px;
}
#tableb>tbody>tr>td:nth-child(2){
    width:170px;
}
#tableb>tbody>tr>td:nth-child(3){
    width:110px;
}
#tableb>tbody>tr>td:nth-child(4){
    width:170px;
}
#tableb>tbody>tr>td:nth-child(5){
    width:110px;
}
#tableb>tbody>tr>td:nth-child(6){
    border-right: 0px solid black;
}



#footer{
    width:802px;
    height: 40px;
    margin:0 auto;
}
#footerone{
  line-height:  40px;
    width:401px;
    text-align: center;
    display: inline-block;
}
#footertwo{
   line-height:  40px;
    width:401px;
    text-align: center;
      display: inline-block;
      float: right;
    
}

/*主要学习的是表格中行列的合并，以及对边框的合并，  border-spacing: 0px；表格的插入方法，以及表格间距的调整，对单个td内容的修改*/